| Property | Value |
|---|---|
| Atomic number | 8 |
| Atomic weight | 15.99943 amu |
| Element family | Non-metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 16O: 99.762%, 17O: 0.038%, 18O: 0.200% |
| Previous element | Nitrogen |
| Next element | Fluorine |
| Density | 0.001429 g/cm3 (STP) |
| Melting | -222.65 °C |
| Boiling | -182.9 °C |
| Covalent radius | 0.63 Å |
| Van der Waals radius | 1.52 Å |
| Ionic radius | 1.4 Å |
| First ionization potential | 13.617 eV |
| Electron affinity | 1.461 eV |
| Electronegativity | 3.44 |
| Discovery year | 1771 |
Oxygen is an element number 8 from non-metals family. Its symbol is O. Oxygen atomic weight is 15.99943 amu. O stable and long lived isotopes are 16O: 99.762%, 17O: 0.038%, 18O: 0.200%. Oxygen electronic configuration is 1s22s22p4. Sample compounds that contain Oxygen are H2O, CO2, NaOH, O2, H2SO4, CaCO3.
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